P,p{40 -bis(benzoxazolyl) tolan derivatives

ABSTRACT

The invention relates to new tolan derivatives of the general formula   OR FOR AN S-TRIAZINYL RESIDUE BOUND THROUGH A CYCLIC CARBON ATOM, A PYRAZOLYL, OXDIAZOLYL, THIADIAZOLYL, FURYL, THIENYL, CUMARYL, QUINAZOLYL, PRYIDYL OR PYRIMIDYL RESIDUE, IN WHICH GROUPINGS A represents a benzene or naphthalene residue condensed with the heterocycle in the indicated manner, and B represents a bridge member -O-, -S-, or NQ-, where Y stands for hydrogen or an unsubstituted or substituted alkyl group, and X stands for a group Y, a hydrogen or halogen atom, in alkoxy group, an unsubstituted or substituted alkyl group or aryl group, an aralkyl, amino, alkylamino, ureido group, a substituted ureido group, a urethane, carboxylic acid ester or amide group or an acylamino group.

United States Patent [72] lnventors Hans Rudolf Meyer Basel; Peter Liechti, Binningen; Kurt Weber, Basel; Adoli Emil Siegrist, Basel, all of Switzerland [2l] Appl. No. 659,343 [22] Filed Aug. 9, 1967 [45] Patented Sept. 28, 1971 [73] Assignee Ciba Limited Basel, Switzerland [32] Priority Aug. 15, 1966 [33] Switzerland [3 l 1 1756/66 [54] P,P'-BIS(BENZOXAZOLYL) TOLAN DERIVATIVES 2 Claims, No Drawings 52 us. c1 260/307 0, 252/3012 w, 260/248 cs, 260/25l R, 260/2564 [51] Int. Cl ..C07d 49/38,

C07d 55/04, C0ld 85/48 [50] Field oiSearch r ...260/307 (4) [56] References Cited UNITED STATES PATENTS 3,133,9l6 5/1964 Duennenberger et al. ,6 260/240 CA 3,260,715 7/1966 Saunders 260/240 Primary Examiner-Alton D. Rollins Attorneys-Harry Goldsmith, Joseph G. Kolodny and Bryant W. Brennan ABSTRACT: The invention relates to new tolan derivatives of the general formula X Z Z where Z stands for a hydrogen atom, a free or functionally modified carboxyl group. a free or functionally modified sulphonic acid group, Y for one of the groupings or for an s-triazinyl residue bound through a cyclic carbon atom, a pyrazolyl, oxdiazolyl, thiadiazolyl, furyl, thienyl, cumaryl, quinazolyl, pryidyl or pyrimidyl residue, in which groupings A represents a benzene or naphthalene residue condensed with the heterocycle in the indicated manner, and 8 represents a bridge member -O-, -S-, or NQ-, where Y stands for hydrogen or an unsubstituted or substituted alkyl group, and X stands for a group Y, a hydrogen or halogen atom. in alkoxy group, an unsubstituted or substituted alkyl group or aryl group, an aralkyl, amino, alkylamino, ureido group, a substituted ureido group, a urethane, carboxylic acid ester or amide group or an acylamino group.

facture.

The new tolan derivatives of this invention correspond to the formula in which Z represents a hydrogen atom, a free or functionally modified carboxyl group, a free or functionally modified sulfonic acid group, Y one of the groupings //N l A or an s-triazinyl residue linked through a cyclic carbon atom, a pyrazolyl, oxdiazolyl, thiadiazolyl, furyl, thienyl, cumaryl, quinazolyl, pyridyl or pyrimidyl residue; A in the above groupings represents a benzene or naphthalene residue eondensed with the heterocycle in the indicated manner, and B stands for a bridge member-O-, -S- or -NQ-, where Q represents hydrogen or an unsubstituted or substituted alkyl group and X a group Y, a hydrogen or halogen atom, an akloxy group, an unsubstituted or substituted alkyl group or aryl group, an aralkyl group, an amino, alkylamino, ureido, substituted ureido, urethane, carboxylic acid ester or amide group or an acylamino group.

Within the scope of this definition functionally modified carboxyl and sulfonic acid groups" are above all their esters (alkyl esters with l to 12 carbon atoms, benzyl esters or the like), their (unsubstituted or substituted) amides and in the case of the carboxylic acids also their nitriles.

The tenn residues" as, for example, in s-triazinyl residue, indicates that these residues may contain further substituents of a nonchromophoric nature conventionally present in these cyclic systems. The symbol B stands preferably for an oxygen bridge atom. The ring system A may represent the benzene ring or a fused-on naphthalene ring, for example N C U Within the definition of X the alkyl groups are above all those containing up to 18 carbon atoms, and aryl groups are preferably benzene and naphthalene residues, which may be substituted. Relevant acylamino groups are preferably those which are accessible by acylating amino groups with aliphatic saturated or unsaturated acids or derivatives (containing up to 18 carbon atoms) or aromatic acids or their derivatives (benzene-carboxylic acids, cyanuric chloride).

Within the scope defined above there are of value, for ex ample, those tolan derivatives which correspond to the formu- Zr Zr in which Y, stands for one of the groupings C-Aryl or represents an s-triazinyl, oxdiazolyl, thiadiazolyl, furyl, thienyl or cumaryl residue; A represents a benzene or naphthalene residue condensed with the heterocycle in the indicated manner, B, stands for an oxygen atom or an -NH- group, and Z, for a hydrogen atom, a sulfonic acid group or a salt or amide thereof, as well as their asymmetrically constituted opposites of the formula where Y, and Z, have the above meanings.

Particularly valuable, especially because of their brightening power, are compounds of the formula in which Y, is a hydrogen atom, a phenyl group or a residue in which R represents a hydrogen atom, an alkyl group with l to 4 carbon atoms or a phenyl group.

Another subgroup of compounds of the general formula (1) corresponds to the following formula where Hal is a halogen atom and Y a hydrogen atom or a group Hal is reacted with an ortho-aminophenol of the fonnula where R and m have the meanings defined abovev it is advantageous to react the acid chlorides of tolan-carboxylic acids with ortho-aminophenols, with or without intermediate isolation of the primarily formed acylamino compounds, by heating to elevated temperatures, for example to 120 to 350 C., advantageously under an inert gas, for example nitrogen, if desired or required in the presence of a catalyst. Suitable catalysts are, for example, boric acid, boric acid anhydride, zinc chloride, p-toluenesulphonic acid, also polyphosphoric acids including pyrophosphoric acid. When boric acid is used as catalyst, it is advantageously used in an amount from 0.5 to 5 percent, referred to the total weight of the reaction mass. It is also possible to use additionally highboiling, polar organic solvents, for example dimethylformamide, dichlorobenzene or trichlorobenzene, or aliphatic, possibly etherified hydroxy compounds, for example propyleneglycol, ethyleneglycol-rnonoethyl ether or 7 diethyleneglycol-diethyl ether, or high-boiling esters of phthalic acid, for example dibutylphthalate. If desired, the process may be carried out in two stages, by first condensing the carboxylic acid halide, especially chloride, with the orthoamino compound in the presence of an organic, inert solvent such as toluene, at xylene, chlorobenzene, dichlorobenzene, trichlorobenzene or nitrobenzene, at a temperature from I00 to 200 C. and then converting the resulting acyl compound at a temperature from to 350 C, if desired in the presence of a catalyst, into the azole derivative. When a carboxylic acid chloride is used as starting material, it may, if desired, be manufactured immediately before the condensation with the o-amino compound and without separation from the free carboxylic acid and thionylchloride, if desired with addition of a catalyst such as pyridine, in the solvent in which the condensation is to be carried out subsequently.

The other tolan derivatives of the general formula (I) are manufactured in a similar manner. For example, the para,paras-triazinyl-tolans are obtained by reacting tolandicarboxylic acid dichloride with benzonitrile and ammonia in the presence of a Friedel-Crafts catalyst such as aluminum chloride.

The compounds of the formula l are also obtained when a halogen, e.g. bromine is added on to the analogous stilbene compound of the formula and the resulting dibromo compound of the formula (10) 11 ill is treated with a strong alkali, for example an alkali metal hydroxide. This presupposes, of course, that the residue X and Y can withstand such an alkali treatment.

The new tolan derivatives of the composition defined above possess in the dissolved or finely disperse state a more or less pronounced fluorescence. Quite a number of these tolans are suitable as optical brightcners for a wide variety of natural or synthetic organic materials. Good results are obtained in brightening polymers, polycondcnsates or polyadducts, for example of epoxy resins, aldehyde resins such as formaldehyde condensates with phenol, urea or aminotriazine; also acryl resin lacquers, alkyd resin lacquers, cellulose ester lacquers, for example acetylcellulose lacquers or nitrocellulose lacquers. The new tolans are specially suited to optically brightening synthetic fibers, for example those from cellulose esters, cellulose propionate or acetylcellulose (cellulose diacetate or triacetate; acetate rayon), or especially from polyamides (for example nylon) or polyesters, or from polyolefins such as polyethylene or polypropylene, and also films, foils, tapes or shaped structures from these materials or other materials such as polyurethanes, polystyrene, polyvinylchloride, polyvinylidenechloride, polyvinyl alcohol or polyvinyl esters of organic acids, for example polyvinyl acetate or other products obtainable by polycondensation, homopolymerization or copolymerization, and finally those from regenerated cellulose, including spun rayon. The new tolans may also be used for brightening natural fibers, for example cotton, linen or wool.

The new tolans may be added to the materials to be optically brightened before, during or after the polymerization, polycondensation or polyaddition.

Accordingly, the present invention includes also a process for optically brightening organic materials, by working into or applying to said materials new tolan derivatives which preferably correspond to the formula in which Y stands for a hydrogen atom or a residue W and W represents a group in which groups R represents a possibly branched alkyl group with one to 12 carbon atoms, an alkoxy group with one to eight carbon atoms, a halogen atom, a phenoxy group or a phenyl group and m=1 or 2, orwhen m=1-R represents a possibly functionally modified carboxyl group or sulfonic acid group or a benzoxazolyl, benzimidazolyl or phenyloxdiazolyl residue and, finally, two residues R together with the benzene ring may form a naphthalene ring; A represents a naphthalene residue fused-on in the manner indicated by the valency lines which may be further substituted, and Z and Z may be identical or different and each represents a hydrogen atom or a sulfonic acid group or a salt or amide thereof.

For optically brightening organic material as described above there are especially suitable derivatives of the formula in which the symbols have the meanings defined above.

The amount of new tolan derivatives of this invention to be used, referred to the weight of the material to be optically brightened, may vary within wide limits. Even a very small quantity, in certain cases for instance as little as 0.005 percent, may suffice to produce a distinct and durable effect. lt is, however, also possible to use a quantity of about 0.5 percent or more.

When the new compounds are used as optical brighteners, they may be applied in combination with carriers, antioxidants, light filters, heat stabilizers, chemical bleaches, as additives to bleaching baths, in admixture with dressings agents, in combination with detergents or in admixture with dyestuffs or pigments or as additives to dyebaths, printing pastes or the like.

It is further possible to apply the compounds of the above formula l fixed on a finely disperse vehicle. They may also be used as scintillators for various photographic purposes, such as electrophotographic reproduction or for supersensitiz- EXAMPLE 1 is suctioned off and dried under vacuum at 90 C., to yield 4.5 g. of a yellow powder. Without purifying this powder, it is heated dry under nitrogen in a salt bath to 325 C.; it melts, splits off water and solidifies again. It is further heated for 15 minutes at 350 C. and then allowed to cool. The grey-brown product weighs 4.0 g. (96 percent of the theoretical yield) and melts at 358 to 361 C. After recrystallization from N-methylformanilide and then from trichlorobenzene with the aid of bleaching earth, the compound of the formula is obtained in yellowish white crystals melting at 360 to 362 C.

" H O N, (molecular weight 412.42)

calculated: C 81.54 H 3.91 N 6.79

found: C 81.27 H 4.11 N 6.84

An analogous reaction with the use of the corresponding aminophenols furnishes the following compounds:

Faintly greenish yellow crystals from trichlorobenzene, melting at 294 to 296 C.

C ,,H O N (molecular weight 524.63) calculated: C 82.41 H 6.14 N 5.34 found: C 82.18 H 6.21 N 5.36.

Faintly greenish yellow crystals from trichlorobenzene, melting at 343 to 345 C. C H, O N- (molecular weight 564.61 calculated: C 85.09 H 4.28 N 4.96 found: C 84.67 H 4.47 N

Greenish yellow crystals from trichlorobenzene, melting at 356 to 358 C.

C40H24O2N2 (molecular weight calculated: C 85.09 H 4.28 N 4.96

found: C 85.38 H 4.42 N 4.83.

MANUFACTURING THE STARTING MATERIAL The tolandicarboxylic acid chloride can be manufactured, for example, as follows:

A solution of 486 g. (1.5 mols) of stilbene-4,4-dicarboxylic acid diethyl ester in 4.5 liters of chloroform is mixed within 2% hours with 262 g. of bromine percent excess). The batch is stirred overnight at room temperature, the crystals formed are suctioned off and washed with a small quantity of chloroform. Yield: 400 g. (67 percent of theory) of the compound of the formula Br Br in colorless crystals melting at 192 to 194 C. Recrystallization from chlorobenzene furnishes white crystals of identical melting point.

C I'I O l3r (molecular weight 484.19)

calculated: C 49.61 H 4.16 Br 33.01

found: C 49.67 H 3.99 Br 32.88.

The yield can be increased by working up the mother liquor. 484 Grams (1 mol) of the dibromo ester described above are dissolved in 4 liters of n-butanol, 1.25 kg. of potassium hydroxide powder containing about 10 percent of water are added and the whole is stirred for 3 hours at the reflux temperature 125 C). The thick, white paste is mixed with 8 liters of water, heated by injection of steam, freed from the butanol layer with heating, and the aqueous phase is rendered acid to Congo red with hydrochloric acid. After suctioning, washing with water and drying, there are obtained 255 g. (96 percent of theory) of tolan-4,4'-dicarboxylic acid as a white powder which does not melt up to 360 C. A specimen sublimed in a high vacuum at 230 to 280 C. reveals the following analytical values:

C I-I O, (molecular weight 266.24)

calculated: C 72.18 H 3.79

found: C 72.07 H 4.03.

A mixture of 213 g. (0.8 mol) of tolandicarboxylic acid, 2 liters of chlorobenzene and 1 ml. of dimethylformamide is mixed at 105 C. within 70 minutes with 180 ml. of thionylchloride. The batch is stirred for 10 minutes, evaporated to dryness under vacuum and the residue is recrystallized from 1 liter of tetrachlorethylene, to yield 207 g. (85 percent of theory) of tolan-4,4'-dicarboxylic acid dichloride in the form of light beige crystals melting at 147 to 150 C. After recrystallization from perchlorethylene almost colorless crystals are obtained which melt at 148 to 150 C.

C l-l O Cl CL weight 303.14)

calculated: C 63.39 H 2.66 Cl 23.39

found: C 63.35 H 2.84 C123.26.

EXAMPLE 2 A mixture of 3.03 g. 0.01 mol) of tolan-4,44licarboxylic acid dichloride, 12.4 g. (0.12 mol) of benzonitrile and 3.03 g. (0.027 mol) of anhydrous aluminum chloride (of 88 percent purity) is cautiously heated to 115 C. while being stirred. At first, a clear solution forms from which a nitrilium salt soon settles out as a deep red precipitate. The batch is stirred for one hour at 115 C., then diluted with 40 ml. of carbon tetrachloride and at the reflux temperature (76 C.) ammonia is injected for 75 minutes into the dark mixture, whereupon it loses its color completely. After cooling, suctioning, washing with methanol, aqueous 2N-hydrochloric acid and water and then drying, there are obtained 5.5 g. (85 percent of theory) of the compound of the formula in fine, greenish yellow flakes melting at 372.5 to 373 C. (after recrystallization from ortho-dichlorobenzene).

C ,,H N +1 l6 dichlorobenzene (molecular weight 721 .36) calculated: C 81.7 H 5.12 N 11.65 CL 1.64 found: C 81.92 H 5.26 N 11.64 Cl 1.63.

example 3 A mixture of 3.03 g. (0.01 mol) of tolandicarboxylic acid dichloride (manufactured as described in example 1), 2.76 g. (0.01 mol) of l-amino-Z-nitrobenzene and 30 m1. of chlorobenzene is stirred for 2 hours at C., during which hydrogen chloride is given off and a thickly liquid suspension forms. After cooling to room temperature, suctioning, washing with carbon tetrachloride and drying, there are obtained 3.9 g. (77 percent of theory) of the compound of the formula as a yellow powder melting at 264 to 267 C. This product is mixed in ml. of ethyleneglycol-monomethyl ether with 20 g. of tin (I1) chloride and 20 ml. of concentrated hydrochloric acid and heated, whereupon it dissolves at 98 C The batch is heated for 3 hours at 110 C., the resulting yellow suspension is allowed to cool, stirred with 400 m1. of 10 percent sodium hydroxide solution, suctioned, the residue is washed with water until neutral and dried, to yield 3.1 g. (98 percent of theory) of the compound of the formula N N s q C/@ C.c@C \A NH as a beige-colored powder which does not melt up to 360 C. After two recrystallizations from dimethylformamide it forms light yellow crystals.

C H N (molecular weight 4 10.46)

calculated: C 81.93 H 4.42 N 13.65

found: C 80.59 H 4.59 N 13.37.

EXAMPLE 4 A mixture of 2.40 g. (0.01 mol) of tolan-4-carboxylic acid chloride, 1.85 g. of 3-hydroxy-4-aminodiphenyl and 40 ml. of chlorobenzene is stirred under nitrogen for 2 hours at the reflux temperature (131 C.), whereupon the elimination of hydrogen chloride is complete. After cooling, suctioning, washing with carbon tetrachloride and drying, there are obtained 3.15 g. (81 percent of theory) of the compound of the formula HO {D as a grey powder melting at 251 to 253 C. which is stirred for 1 hour at 213 C. in 20 ml. of trichlorobenzene with 0.1 g. of boric acid anhydride, during which about ml. of trichlorobenzene and the water formed are allowed to pass over. After cooling, suctioning and washing with carbon tetrachloride there are obtained 2.7 g. (87 percent of theory) of the compound of the formula as a beige colored powder melting at 195 to 205 C. After two recrystallizations from ortho-dichlorobenzene with the aid of bleaching earth it forms pale yellow crystals melting at 196 to 1 9 8 C.

C H ON (molecular weight 371.44)

calculated: C 87.31 H 4.61 N 3.77

found: C 86.01 H 4.74 N 3.79.

The to1an-4-carboxylic acid chloride used as starting material can be prepared, for example, as follows: In the course of 2 hours 70.0 g. of bromine (about 10 percent excess) are dropped into a solution of 95.2 g. (0.4 mol) of stilbene-4-carboxylic acid methyl ester in 300 ml. of chloroform, and the mixture is stirred on at room temperature, during which crystals slowly settle out from the solution. After 16 hours the batch is evaporated to dryness, to furnish 160 g. of a light brown crystallizate melting at 186 to 189 C. (Crude yield is practically quantitative). After two recrystallizations from methylenechloride the compound of the formula CHBrCHBr COOCH is obtained in colorless crystals melting at 196 to 198 C.

C H O Br, (molecular weight 398.10)

ca1culated:C 48.27 H 3.54 Br 40.14

found: C 48 .2111 3.74 Br 40.22.

A mixture of 39.8 of the dibromo ester (0.1 mol), 125 g. of potassium hydroxide (of 90 percent purity) and 400 ml. of butanol is stirred for 1 hour at the reflux temperature (129 C.), then 1 liter of water is added, the butanol 1ayer-which contains almost the whole potassium salt of the tolancarboxylic acidis separated in a separating funnel, evaporated to dryness, and the residue is dissolved in hot water and acidified with hydrochloric acid. After suctioning, washing with water and drying, there are obtained 18.0 g. (81 percent of theory) of tolan-4-carboxylic acid as a white powder melting at 208 to 210 C. During storage its melting point rises to 218 to 220 C. A specimen sublimed in a high vacuum at 185 to 190 C. melts at 220 to 230 C.

C H O (molecular weight 222.23)

calculated: C 81.06 H 4.54

found: C 80.37 H 4.66.

On reaction with thionylchloride in boiling chloroform a 'practically quantitative yield of to1an-4-carboxylic acid chloride is obtained which, after recrystallization from chloroform, melts at 89 to 90 C.

C, H OC1 (molecular weight 240.69)

calculated: C 74.85 H 3.77 CL 14.73

found: C 74.81 H 3.80 CL 14.61.

EXAMPLE 5 A mixture of 2.4 g. (0.01 mol) of tolan-4-carboxylic acid chloride (prepared as described above), 1.4 g. (0.01 mol) of l-amino-Z-nitrobenzene and 20 ml. of chlorobenzene is stirred for 2 hours at to C., then evaporated to dryness under vacuum and the residue is recrystallized from a small quantity of chlorobenzene, to yield 2.2 g. (64 percent of theory) of the compound of the formula as a white powder melting powder melting at 287 to 289 C. Recrystallization from ortho-dichlorobenzene furnishes colorless crystals melting at 287 to 288 C.

C ,H N (molecular weight 294.34)

calculated: C 85.69 H 4.79 N 9.52

found: C 84.93 H 4.91 N 9.35.

EXAMPLE 6 100 Grams of polyester granulate from terephthalic acid ethyleneglycol polyester are intimately mixed with 0.05 g. of the compound of the formula or of the formula and melted at 285 C. with stirring. When this mass is spun through conventional spinnerettes and the filaments are stretched, polyester fibers displaying a good brightening effect are obtained.

EXAMPLE 7 2.22 Grams of 4'-phenyl-tolan-4-carboxylic acid in 20 ml. of trichlorobenzene are converted with 8 ml. of thionylchloride into the acid chloride by short heating at 95 C., then the solution is freed from excess thionylchloride under vacuum and 1.38 g. of 3-hydroxy-4-aminodiphenyl are added. The batch is heated under nitrogen within 2 hours to 2l0 C., during which at first hydrogen chloride and then water escapes, the whole is further stirred for 2 hours at 210 to 212 C., allowed to cool, suctioned, washed with carbon tetrachloride and dried, to yield 3.2 g. of the crude compound of the formula practically colorless crystals from dioxane, melting at 232 to C l-[ (molecular weight 314.36) calculated: C 84.05 H 5.77 found: C 83.76 H 5.72

colorless powder, melting at 2 l 6 to 218 C.

CEC COOH colorless crystals from glacial acetic acid, melting at 291 C.

C ,H,,O (molecular weight 298.32) calculated: C 84.54 H 4.73 found: C 84.59 H 4.81.

EXAMPLE 8 A solution of Si g. (0.1 mol) of 4,4'-diaminotolan-2,2'disulfonic acid (72 percent), in the form of the disodium salt, in one-half liter of water is mixed with a solution of 138 g. of sodium nitrite in ml. of water, and the batch is indirectly tetrazotized for one-half hour with 50 ml. of concentrated hydrochloric acid in 150 ml. of ice water at 6 to 8 C. After 1 hour a slight excess of nitrous acid is decomposed with sulfamic acid. The suspension of the tetrazo compound is then added to a solution of 44.6 g. (0.2 mol) of 2-aminonaphthalene-5sulfonic acid, 10.6 g. (0.1 mol) of sodium carbonate and 50 g. of crystalline sodium acetate in one-half liter of water. On completion of the coupling the reaction mixture (pH=4.3) is neutralized with 28 g. of sodium carbonate and the deep red bis-ortho-aminoazo dye is precipitated with 400 g. of sodium chloride and suctioned off. The moist dye is then dissolved in one-half liter of hot water with addition of 40 ml. of concentrated ammonia, and a solution of g. of crystalline copper sulfate in 480 ml. of water and 240 ml. of concentrated ammonia is mixed in. The mixture is stirred at 82 C. until the red color has disappeared and after cooling the bis-triazole compound is salted out with sodium chloride. The filtered-off crude product is washed with dilute ammonia and in the usual manner purified and dried. Recrystallization from water, if necessary with addition of a small quantity of sodium chloride, furnishes the tetrasodium salt of the formula l N303 S 1 4 s om; N

S OsNa C H O N Sma. (molecular weight 938.76) calculated: C4350 H L93 N 8.95 S 13.66 found: C 43.54 H 2.l2 N 8.88 S 13.80.

EXAMPLE 9 14 tion with potassium iodide-starch) the suspension of the calculated: N 8.95 S 13.66 tetrazo compound is added to a cooled solution of 45.0 g. (0.2 found: N 8.68 S 13.41 mol) of Z-naphthyl-amine-l-sulfonic acid, 20.7 ml. of 29 per- The use of 2-naphthylamine-5.ldisulfonic acid as coupling cent sodium hydroxide solution and 50 g. of crystalline sodium component gives rise to the sodium salt of hcxasull'onic acid of acetate in one-half liter of water. The suspension is stirred for 5 the formula 2 hours at 8 to 10 C. (pH=4.3) and neutralized with concentrated sodium hydroxide solution. On completion of the coupling the deep red bis-ortho-aminoazo dye is suctioned off (35) N and stirred into a solution of 200 g. of copper acetate in 200 ml. of water and 100 ml. of concentrated ammonia. The whole 10 q is heated at about 90 C. until the red color has disappeared, I allowed to cool, filtered and the residue is washed with a small NnOlS i so Nu quantity of water. Recrystallization from aqueous dimethylformamide with the use of active carbon and drying in a high vacuum at 100 C. furnishes the hygroscopic disodium salt of the formula SO;Nu

calculated: N 7.18 5 10.44

found: N 7.41 S 16.49. C H, O,N S Na- (molecular weight 734.68)

calculated: C 55.59 H 2.74 N 11.44 S 8.73 EXAMPLE 1 found: C 55.38 H 3.12 N 11.21 S 8.10.

In an analogous manner, with the use of 2-naphthylamine-6- sulfonic acid or 2-naphthylamine-7-sulf0nic acid as coupling component, the compounds of the formulas (33) and (34) are obtained:

When 3-methoxy-p-toluidine is used as coupling component in the process of example 9, the compound of the formula (36) is obtained on recrystallization from dimethylformamide.

Naols- I a, (it'll,

C H,.O N,S,Na (molecular weight 722.6(1)

calculated: c 49.86 H 3.35 N 11.63 s as"! 1 M found: c 49.78 H 3.65 N l 1.94 s 8.89.

in the process of example 8, the compound of the formula (37) is obtained; it crystallizes from aqueous dimethylsulphoxide.

NaO S a When S-amlnoacenaphthene ls used as coupllng component SUJNU.

calculated: N 8.95 5 13.66 found: N 8.63 S 13.66

EXAMPLE 1 l l g. of active chlorine (Javelle water) 4 g. of a detergent of the following composition:

A fine suspension of 5.3 g. of 4,4-diaminotolan in 200 ml. dodecylbenzenesulphonate of water and 12.5 ml. of hydrochloric acid is diazotized with a solution of 3.5 g. of sodium nitrite in ml. of waterv The 5 z z g jgggzg tetrazo compound is coupled with 1 1.3 g. of 2-naphthylamine- 28% cacined sodium Sulfate (Gaubem Sam 5-sulfonic acid as described in example 8 and the red dye is 5% Sodium metasilicate oxidized with a solution of g. of copper acetate in 25 ml. of 2% carbomehoxycenulose F 25 of concentrated ammoma and 125 of After having been rinsed and dried, the fabric displays a pyndme to the compound of the fmmua very strong brightening effect which has good fastness to acids (38) and chlorine. N We claim: i l. A compound of the formula N where Y represents a member selected from the group con- 3 sisting of hydrogen, phenyl or the residue y 25 N SO;Na

which is recrystallized from dimethylformamide.

c H o S Na. (molecular weight 716.66) calculated: N 11.73 S 8.95 found; N 1L4 S 9 and where R represents a member selected from the group consisting of an alkyl group containing l to [2 carbon atoms, EXAMPLE l2 and phenyl.

Bleached cotton fabric is washed for 30 minutes at a goods- A compound according to dmm 1 having formua to-liquor ratio of 1:30 in a liquor heated at 60 C. which contains per liter the following ingredients:

0.02 g. of the brightener of the formula y M10 8 N where R stands for hydrogen, an alkyl group containing l to 4 U carbon atoms or phenyl.

2% UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION 3,609,160 Dated September 28, 1971 Patent No.

Inventor(s) HANS RUDOLF MEYER ET AL 7 It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 16, line 36, after "consisting of" insert hydrogen Signed and sealed this 13th day of June 1972.

(SEAL) Attest:

ROBERT GOTTSCHALK EDWARD M.FLE'I'CHER,JR. Attesting Officer Commissioner of Patents 

2. A compound according to claim 1 having the formula 